Objects of the value stream toolbox > Process objects

Contents

1. Brief description

A multiple process can process several products simultaneously and independently of each other. The internal structure of the object is the same as that of the parallel station.

The object facilitates the modeling of several identical stations that process parts parallel to each other.

2. Procedure and control description

The information about the product to be processed arrives via a production order. A PPS, a subsequent supermarket or a Kanban object create production orders.

The process orders the basic products needed for the production order from a previous storage, supermarket or supplier.

Often processes are not only charged with production orders from only one production line, but also for production orders from other production lines.

Using the Foreign Order object, these shared resources can be projected onto the respective process object.

Only one production order is processed at a time. However, this production order is processed in parallel on all stations.

Note that the actual cycle time of the product is defined in the product definition, that is, the time interval at which two products leave the object.

This is not the processing time of the products on the object!

Furthermore it can be differentiated whether the respective process contributes to the increase in value of the finished product or not.

20220718_process_multiple

Figure 1 - Procedure and control description

3. Parametrization

20230217_object_process_multiple_EN

Figure 2 - Process (Multiple)

Process Parameter	Required	Description
Name	no	Name of the object
Products	no	Products of the object
Is value adding	no	Determining whether a process contributes to increasing the value of a product
Number of workers	yes	Number of assigned workers per process
Capacity	yes	Number of possible workstations
Setup time	yes	Time required for an object to prepare for an upcoming product
Create setup matrix	no	Opens a new view to create a setup matrix
Availability	yes	Reliability (in %) with which an object operates without interference. Percentage only refers to the working time status (machine is not disturbed during unplanned, paused, waiting or setting-up)
MTTR	yes	Meantime to Repair: Time required to repair a malfunction
Exit strategy	yes	Logic according to which the products leave the object Available modes: •Cyclic (blocking) •Start at successor 1 (cyclic, non-blocking, each test with start at first successor; corresponds approximately to "overflow control") •First free successor (cyclic, non-blocking, start at last successor + 1) •Lowest occupancy (lowest relative capacitive occupancy; without paused and disturbed parts, weighted by time)
Shift calendar	no	Allocation of working hours and rest periods
Rework in station	no	Determining whether a product to be reworked is reworked on the respective process
Base product in storage for order start	no	Determining whether a base product is in storage for order start or not
Comment	no	Custom notes and annotations

Product Parameter	Required	Description
Product	yes	Product to be processed
Base product	yes	Product required to manufacture selected product
Required base products	yes	Number of basic products required
Lot size	yes	Quantity of products produced
Planned cycle time	no	Average planned cycle time per day
Cycle time	yes	Time interval between two products (independent of lot size)
Transfer quantity	yes	Required quantity of products before transfer (regardless of lot size)
Rework rate [%]	yes	Probability (in %) of marking products for rework. Selected products are processed at the first possible station Rework can be done in the station itself or at the next junction for rework (corresponding edge). A part is either scrap or rework at the end of a machining operation, i.e. a part that is to be reworked is not destroyed in the same station ([percentage good parts +] percentage scrap + percentage rework)
Scrap rate [%]	yes	Probability (in %) with which products are marked as unusable. Selected products are deleted immediately after processing A part is either scrap or rework at the end of a machining operation, i.e. a part to be destroyed is not reworked in the station ([percentage good parts +] percentage scrap + percentage rework)
Priority	no	Position of the order in the order list. The higher the priority, the earlier the order is processed.
Min. reworking time	yes	Minimum rework time of a product
Max. reworking time	yes	Maximum rework time of a product

4. Connection types

See chapter Possible connections to objects.